What can you do if you spill Liquid plumber on Hardwood that has been coated with Polyurothane?

I have been redoing the floors for a house i am selling, and i came home today and there was some Liquid Plumber that had spilled out onto the floor. Is there anyway to fix this or am i going to have to lay down a new floor? The Drain cleaner looks to have soaked into the floor. ANY help would be appreciated